Powermate 5pc Grinding Stone Set: * Includes: * 1 tapered tree stone course grit * 1 conical barrel stone course grit * 1 barrel stone medium grit * 1 orb stone fine grit * 1 conical stone course grit * 1/4" shanks * For use on 1/4" collet tools, maximum 25,000 rpm * Model# 024-0286pm